Machine for sharpening the edges of plowshares and other plow-steels



(No Model.)

E. S. HARTMAN.

MACHINE FOB. SHARPENING THE EDGES 0F PLOWSHARES AND OTHER PLOW 'STBELS.

No. 268,401. Patented Dec. 5, 1882.

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UNITED STATES PATENT OFFICE.

A EDWARD S. HARTMAN, OF ALLEGHENY, PENNSYLVANIA.

MACHINE FOR SHARPENING THE EDGES OF PLOWSHARES AND OTHER PLOW-STEELS.

SPECIFICATION forming part of Letters Patent No. 268,401, dated December5, 1882,

Application filed June 5, 1882. (No model.)

To all whom it may concern:

Be it known that I, EDWARD S. HARTMAN, of Allegheny, in the county ofAllegheny and State of Pennsylvania, have invented a new and useful Improvementin Beveling-Machines; and I do hereby declare the following tobe a full, clear, and exact description thereof.

It has heretofore been customary to sharpen 0r bevel plowshares and thecutting-edges of other agricultural steels and various cuttingtoolsunder a trip or drop hammer upon a beddie the face of which and the faceof the hammerconverged toward each other. The blank was presented by theoperator, who fed it along until by a series of blows the entire edgewas beveled. In this operation the operator was guided entirely by theeye, and his experience in regulatingtheforce of the blows of thehammerandthedistancethe blankshould be placed under it. Consequently thequality of the work depended upon the skill of the workman, and was notuniform in character- Moreover, the operation was comparatit'ely slowand the edges produced uneven.

To enable others skilled in the art to make and use my invention, I willnow describeits construction and operation by reference to theaccompanying drawings, in which- Figure 1 is a side elevation of myimproved beveling-machine. Fig. 2 is a plan view, and Fig. 3 is a sideview of the moving jaw and lever.

Like letters of reference indicate like parts in each.

At the front end of a suitable frame, a, is the lower die-bed, b, uponwhich is secured a stationary die, 0. In ajaw, d, is the upper ormovable die, 6. The faces of the two dies 0 and e converge toward eachother, so that they form a flaring cavity, f, in which the edge of theblank is placed when it is presented to them. The jaw d is provided withjournals d, which have their bearings in suitable boxes, g, in the sidesof frame a. Extending back of the journals is an arm or lever, (1 of thejaw d, which rests upon an eccentric, h, mounted on a power-shaft, i.This eccentric h operates thcjaw d, and thereby the die 6, through themedium of the lever d. The jaw 01 is so journaled and adjusted withreference to the die 0 that the die 6 has a curvilinear movement as itapproaches the jaw c, and hence not only bevels the blank, but draws themetal slightly, so as to produce a longer sharper bevel than it would ifstruck a directly vertical blow by a drop or hammer. The shafti isprovided with a pulley, 7c, and fly-wheel Z.

The operation of my machine is as follows: Power is applied to thepulley by a belt, and the jaw dis caused to oscillate with greatrapidity. The plate or other blank is presented by thrusting the edgeinto the cavityf, and then feeding it along as thcjaw nips, bites, orpinches an edge on it. The operation of the jaw is extremely rapid, andthe plate can be moved along with almost no perceptible pause as thejawbites.

No especial skill is required in usingthe machine, as it is onlynecessary in presenting the plate to rest it on the lower die and pressitas far in as it will go. A uniform and. perfect edge is produced.

By making the lower die flat the bevel will be made on one side only,the face of the upper die converging to that of the lower one. This isequally a part of the invention, and is useful in sharpening tools inwhich the bevel is on one side only.

A modification of my'machine is to mount both dies in moving jaws, eachof which may be operated by eccentrics on the same shaft.

The invention is useful for sharpening and beveling agricultural steelsand tools of all kinds, and also for beveling metal for many otherpurposes.

What lclaim as my invention, and desire to secure by Letters Patent, is-

In a machine for beveling plowshares and other implements, thecombination of a bed or

